Filter portion of an upright vacuum cleaner



FIG. 1 is a top-front perspective view of a filter portion of an upright vacuum cleaner showing my new design;

FIG. 2 is an enlarged view thereof.

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a left side elevational view thereof.

In FIGS. 1, 2, 3, 4, and 5 the broken lines showing the feature of an upright vacuum and associated details are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a filter portion of an upright vacuum cleaner, as shown and described. 